Called to sort out water leaking from loft? Went up there to find CWSC overflowing, so turned off mains and fitted isolation valve, then replaced CWSC valve (and F+E valve). Turned water back on and depressed valves to check everything was ok. Then I got a surprise? On depressing f+e ball valve, water dropped into CWSC. I thought I thought overflow pipe was not properly sealed but on closer inspection, it was actually overflowing into the CWSC? Why did he fit it that way? On looking into the whole thing closer, it turns out it was the f+e valve that had been at fault but as contents was discharging into CWSC, that made it look like fault was from CWSC valve. Madness, utter madness.
